body {
    font-family: Arial, sans-serif;
    background: linear-gradient(to right, #4facfe, #00f2fe);
    text-align: center;
    color: white;
    margin: 0;
    padding: 0;
}

.container {
    margin-top: 100px;
}

h1 {
    font-size: 50px;
}

button {
    display: block;
    width: 200px;
    margin: 20px auto;
    padding: 15px;
    font-size: 18px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.3s;
}

.btn-start {
    background-color: #28a745;
    color: white;
}

.btn-sobre {
    background-color: #ffc107;
    color: black;
}

button:hover {
    transform: scale(1.1);
}

#sobre {
    display: none;
    margin-top: 30px;
    padding: 20px;
    background: rgba(0,0,0,0.3);
    border-radius: 10px;
    width: 60%;
    margin-left: auto;
    margin-right: auto;
}